北京永定河(官厅—三家店)水体有毒有机污染物的致突变性研究

Mutagenicity of toxic organic pollutants in Yongding River (Guanting Reservoir-Sanjiadian), Beijing

于1999年7月采样对北京西南永定河(官厅—三家店)水体进行了有毒有机物污染状况的研究。水中有机物通过XAD-2树脂进行富集,沉积物样品经冷冻干燥和索氏提取后,用于Ames实验。结果表明,永定河已受到了相当程度的污染,但静止水体(水库大坝和三家店)未表现出致突变性,流动水体(八号桥和雁翅)具有较强的致突变性,最上游的八号桥点致突变性最强。沉积物样品的致突变性表现出几乎与此相反的规律,但除雁翅点样品对TAl00菌株外,所有样品都表现出较强的致突变性。表明水库已成为污染物的储藏库并对下游造成二次污染,应引起有关部门的重视。

A research is made on the trace organic pollutants of Yongding River, which provides water mainly for southwest of Beijing City. The samples were collected in July 1999. The pollutants in water samples are concentrated with XAD 2 resin column while the sediment samples were conducted with freezing dryer and Soxhlet. The samples are analyzed by Ames test for mutagenicity. The resultsindicate that the Yongding River has been polluted, but no mutagenicity could be observed in the static water (the Guanting Reservoir dam and Sanjiadian pool).The flowing water (Bahaoqiao and Yanchi) shows greater mutagenic effect compared with static water and the strongest effect is observed in Bahaoqiao at the upper stream. The mutagenicity of sediment samples shows the trend almost opposite to the result of surface water, positive result is obtained in all samples except for the sample of Yanchi in the test of TA100. The results demonstrate that the reservoir had become the deposit of pollutants and caused contamination to thedownstream area.